... price, support tape player, recordable Features of our H-001 car amplifier: 1, this machine can only use 12V battery-powered 2 ... negative polarity can not be reversed 3, amplified in the car when, 12V battery should be connected at both ends, and ... work 6, support tape player, recordable 1, when in the car speakerphone, 12V battery should be connected at both ends, and ...